[aaronmacy]

one of these can be shortened: cw - deletes the current word & enters insert mode

[bpeebles]

Not quite: cw deletes until the end of the current word from the current position and then enters insert mode. ciw deletes the entire your current position is in and enters insert mode. Go ahead and try them.

[dokem]

Apparently yiw can be shortened to yw as well